Record-resurfacing machine



Sept. 3; 1929. H. P. ROBERTS 1,726,588

RECORD RESURFACING MACHINE Filed Julyv 28, 1925 CwmcEWWTTORNEY Patented Sept. 3, 1929.

UNITED STATES 1,726,588 PATENT OFFICE.

HENRY i. ROBERTS, OF BROOKLYN,` NEW YORK, -AssIeNOR TO DIOTAPHONE CORPORA- TION,"Ois` RRIDGEPORT, CONNECTICUT, A CORPORATION or NEW YORK.

RECORD-RESURFACING MACHINE.'

Application lled July 28,

This invention relates to machines for shaving or resurfacing phonograph record blanks for preparing the surface of such blanks for use.

An object of the invention is to provideV curately fit, that is, by avoiding extremelysmall tolerances in the manufacture ofthe Various parts.

Other objects and advantages will hereinafter appear.

In the accompanying drawing, which shows by way of example one embodiment of this invention, that at present preferred,

Figure 1 is a top plan View of a record shaving machine showing the present invention as embodied therein.

Fig. 2 is a side elevation of a portion of the machine shown in Fig. 1, showing the record mandrel and the record blank, and parts of the frame in section.

Fig. 3 is a perspective View of part of the feed-nut mounting means.

Fig. 4; is a perspective view of the feed-nut and part of its mounting.

-As shown in the accompanying drawing, the shaving machine preferably comprises a base upon which is rotatably mounted a record mandrel 11 secured to a shaft 12 having a pulley 13 connected with a motor, not shown, through a belt 14. .f

Also connected to the mandrel shaft 12 is a pulley 15 connected by a belt'16 to a pulley 17 lsecured to a feed-screw shaft 18 journaled in the frame of the machine to the rear of the mandrel 11.

The record surface is adapted to be shaved, burnished or resurfaced by means of a knife or other tool 19 adjustably mounted in a guide 20 secured to, or preferably forming part of, a carriage 21 which is mounted upon a guide rod 22 to travel longitudinally of the mandrel and the record supported thereby. The carriage 21 is-held in proper operating position by means of a weighted arm 23, which has a lower guide arm 24 formed integral therewith, and normally resting and `with a feed-nut 1925. 'serial No. 46,577.

rail 25 at the front of the screw 18. y

Heretofore, this feed-nut has been mounted upon a spring, or other resilient member, rigidly secured to the carriage sol that the that of the axis of the feed-screw toaccommodateitself to irregularities in the feed-screw thread. But, it has been found, in such devices, that while the supporting device for the nut actually yields, it does, however, transmit vibrations to the carriage 21 and through it to theknife or other tool 19 with the result that irregularities lor grooves are produced upon the record surface, due to the transmission of such vibrations.v `It has also been found that a mounting member, which is sufficiently resilient to prevent the transmission of such .undesired vibrations, istoo resilient to permit the carriage to travel properi ly with the feed-nut.

The present invention, however, has overcome these disadvantages by providing a support for the feed-'nut 26 which is sufficiently firm as to prevent skewing movement between the feed-nut and the carriage, and yet, which freely yields ina direction perpendicular to the axis of the feed-screw, and thus allows the vibrations to be almost entirely absorbed by such yielding movements. y

p For this purpose, the feed nut 26'is securely mounted on one arm 27 of a hinge, and the other arm 28 of which is securely fastened to the carriage 21 by means of screws 29.

Preferably, this hinge is formed by bending-up a'pair vof arms 30 on the part 27 and an arm 31 on the the But, of course, any other suitable form of pivotal connection` may be provided between the parts 27 and 28, so -lon as any appreciable skewing movement of t e nut 26 with re-l lation to the carriage is prevented, andso` art 28 to form cylin` drical sockets into which abolt 32 is placed.y

` feed-nut `might move in a 'plane common to l end to the part 27, and at the other end to an arm 34 depending from the part 28. This spring normally tends to hold the feed-nut in positive engagement with the threads of the feed-screw, but allows the part 27, carrying the feed-nut, to move vertically to absorb the vibration due -to irregular'portions or bruises on the threads on the feed-screwlS. ,y

When the carriage 2l reaches the limit of its movement when movi-,ng Vin the direction toward the pulley as seen in Fig. l, that is to Say. when the wel.. 19 has been moved beylfld` the inner end of the record blank, supported by the mandrel l1', no further movement `of the carriage is permitted. -Toavoid damageV being donato the threads ofthe screw or nut while the carriage is, in this position during Qpenaton .0f the machine, the feed-screw 18 has a cut-away portion 35 to provide a smooth surface. Heretofore, the nut, upon engaging the cut-away vportion 35 ofthe lfeedyscrew, might ride upon the smooth surface,

and while this was not particularly objectionable, .yet the feed-nut would be worn somewhat by the abrasion thus produced between the tops of its teeth andthe cut-away portion 35 of the, feed-screw.

To avoid this wearingof the feed-nut, the

" present invention provides upon the part 27 which supports the feed-nut, a limit screw 36 Whose lower end is adapted to engage the part 28 and hold the feed-nut from direct engagement with thecut-outportion 35 when the feed-nut has been moved to this portion of the feed-screw. Since the `feed-nut is held in proper position `by means of the spring 3,3 which freely yields, it is possible to allow the feed-nut threads, to bottom on the threads of the feed-screw. `Hence,` the limit screw may be, and preferably is, so. adjusted as to permit this action. This is adecided advantage over devices `heretofore provided,y for in such devices it was necessary to so adjust the feed-nut or its mounting as to prevent the bottoming of the feed-nut on'the.V feedscrew, which was a diliicult and unsatisfactory adjustment to make.

To permit the adjustment of the feed-nut relatively to its mounting so.. that in spite of slight differences in the manufacture of the parts, the feed-nut may always be made to properly engage the feed-screw, the. feed-nut 26 is secured upon the part ,27 of the hinge by means of one or more screws-3,7 engaging. the feed-nut and passing through elongated slots 38 in the partv'27. To adj ust the feed-nut, the screws 37 may be loosened and the feed-nut'moved to proper position, which vface may be produced on the record blank.

For the purpose of avoiding this, the invention provides a take-up device in the form of spring arms 39 (see Figs. l and 2), which are mounted on an extension 40 of the part 23 of the hinge for mounting the feed-nut 26.. The ends 39 engage the guide rod 22, and are so located and arranged that their pressure upon the guide rod are suflicient at both ends 4l of the carriage so as to hold the carriage in proper osition during its travel across the frame of t e machine. I

By mounting the spring arms 39 on the part 28 of the feed-nut mounting, the device of the present invention may be applied to new machines or preexisting machines as a unitl and by the simple expedient of placing the device on the carriage in the same position and place as would be occupied by the device formerly used and then securing it to the carriage by two screws 29.

While I have shown the invention as applied to record resurfacing machines especia-ily adapted for resurfacing cylindrical rec-- ord blanks, it should be distinctly understood that the invention may also be used in inachines for shaving or reconditioning flat record blanks.

It will also be understood that variations may be made within the scope of the invention and portions of the improvements may be used without others.

vHaving now described the invention, what is claimed as new, and for which it is desired to obtain Letters-Patent is:

l. In a 'device for resurfacing phonographic record blanks, a frame; a'tool carriage mounted on the frame, a guide rod on the frame on which' the carriage is pivotally mounted; a feed-screw on the frame; and a feed-nut mounted on the carriage and adapted to have free pivotal movement with relation tothe carriage perpendicularly of the axis of the feed-screw and about an vaxis offset from the axis of the guide ro'd upon which the carriage is pivotally mounted.

2. In a device for resurfacing phono-- graphic record blanks, a frame; a tool carl OU riage mounted on the frame; a feed-screw'` mounted on the frame; a feed-nut for engaging the feed-screw; a pivoted arm mounted on the frame and adapted to carry the feed-nut; and a set-screw on the said arm adapted to engage the carriage to determine the position of the feed-nut with relation toy the feed-screw.

3. In a device for resurfacing phonographic record blanks, a frame; a Vtool cary riage mounted on the frame; a feed-screw mounted on the frame; a feed-nut for engaglng the feed-screw; a plvoted arm mounted on the frame; and a tension spring for yield- `graphic record blanks, a frame; a tool caringly holding the pivoted arm in position to cause the feed-nut to bottom upon the threads of the feed-screw.`

4. In a device for resurfacing phonographic record blanks, a frame; a tool carriage mounted on the frame; a feed-screw mounted on the frame; a feed-nut for engagtween the feed-nut and the carriage; and means for limiting the movement of the feednut toward the axis of the feed-screw.

5. In a device for resurfacing phonographic record blanks, a frame; a tool carriage mounted on the frame; a feed-screw l mounted on the frame and havin a cut-away portion at one end; a feed-nut or engaging the feed-screw adapted to travel to a position above the cut-away portion of the feed-screw means for yieldingly urging the feed-nut towards the axis of the feed-screw to cause the feed-nut to engage a threaded portion of the feed-screw; and means for preventing the feed-nut from engaging the cut-away portion of the feed-screw.

6. In a device for resurfacing phonographic record blanks, a frame; a tool carriage mounted on the frame; a feed-screw mounted on the frame and havino' a cut-away portion at one end; a feed-nut fbr engaging the feed-screw adapted to travel in position above the cutaway portion of the feed-screw; means for yieldingly urging the feed-nut towards the axis of the feed-screw to cause the feed-nut to engage a threaded portion of the feed-screw; and means for limiting the movement of the feed-nut towards the axis ing the feed-screw; a hinge connection loe-` of the feed-screw so as to prevent threads of the feed-nut from engaging the cut-away p0rtion of the feed-screw.

7. In a device for resurfacing phonoriage mounted on the frame; a feed-screw mounted on the frame; a feed-nut for engaging the feed-screw; and means for supporting the feed-nut in position to engage the feed-screw comprising a part detachably mounted on the carriage and a part attached to the feed-nut, said parts being hinged together.

8. In a device for resurfacing phonographic record blanks, a frame; a carriage mounted on the frame for travelling movement; a guide rod upon which the carriage slides; and resilient means for automatically taking up looseness between the carriage and the guide rod.

9. In a device for resurfacing phonographic record blanks, a frame; a carriage mounted on the frame; a guide rod upon which the carriage slides; and automatic means for taking up wear between the Guide rod and carriage to hold the carriage ibrmly to the guide rod.

10. An attachment for phonographic record resurfacing machines comprising a hinge,

one part of which may be attached to the carriage slidably mounted on a guide rod and the other part of which is attached to a feednut; and means on the first-named part for` taking up looseness between the carriage and the guide rod.

Signed at New York, in the county of New York and State of New York, this 22nd day of July 1925.

HENRY P. ROBERTS. 

